#' Some TSP instances from the TSP-LIB library
#'
#' @description A list containing some instances of the travelling salesman problem from the TSP-LIB library. For each instance, the matrix distance is available without need of defining a distance calculation function.
#'
#' @format Each instance is wrapped in a list, with parameters depending on information availability:
#' \describe{
#' \item{size}{The number of nodes of the TSP instance.}
#' \item{description}{A brief description of the source of data.}
#' \item{points}{A data frame with the coordinates of each point. Can be presented in (x,y) or in (Lon, Lat) format, depending on the instance.}
#' \item{D}{A square matrix containing all distances between nodes. At the moment, all the instances included are symmetric.}
#' \item{opt.tour}{The optimal tour. If it is not availabe a 'Not Available' message is returned.}
#' }
#'
#' @source \url{http://elib.zib.de/pub/mp-testdata/tsp/tsplib/tsp/index.html}
#'
#' @examples TSPLI_sample$gr21
#'
"TSPLIB_sample"
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